SciTech Connect

Title: The conversion of biomass to ethanol using geothermal energy derived from hot dry rock to supply both the thermal and electrical power requirements

The conversion of biomass to ethanol using geothermal energy derived from hot dry rock to supply both the thermal and electrical power requirements The potential synergism between a hot dry rock (HDR) geothermal energy source and the power requirements for the conversion of biomass to fuel ethanol is considerable. In addition, combining these two renewable energy resources to produce transportation fuel has very positive environmental implications. One of the distinct advantages of wedding an HDR geothermal power source to a biomass conversion process is flexibility, both in plant location and in operating process is flexibility, both in plant location and in operating conditions. The latter obtains since an HDR system is an injection conditions of flow rate, pressure, temperature, and water chemistry are under the control of the operator. The former obtains since, unlike a naturally occurring geothermal resource, the HDR resource is very widespread, particularly in the western US, and can be developed near transportation and plentiful supplies of biomass. Conceptually, the pressurized geofluid from the HDR reservoir would be produced at a temperature in the range of 200{degrees} to 220{degrees}c. The higher enthalpy portion of the geofluid thermal energy would be used to produce a lower-temperature steam supply in a countercurrent feedwater-heater/boiler. The steam, following a superheating stage fueled by the noncellulosic waste fraction of the biomass, would be expanded through more » a turbine to produce electrical power. Depending on the lignin fraction of the biomass, there would probably be excess electrical power generated over and above plant requirements (for slurry pumping, stirring, solids separation, etc.) which would be available for sale to the local power grid. In fact, if the hybrid HDR/biomass system were creatively configured, the power plant could be designed to produce daytime peaking power as well as a lower level of baseload power during off-peak hours. « less
Authors:
Publication Date:
OSTI Identifier:538043
Report Number(s):LA-UR--97-2077; CONF-970701--
ON: DE98000265; TRN: 97:005464
DOE Contract Number:W-7405-ENG-36
Resource Type:Conference
Data Type:
Resource Relation:Conference: 32. intersociety energy conversion engineering conference, Honolulu, HI (United States), 27 Jul - 2 Aug 1997; Other Information: PBD: 1997
Research Org:Los Alamos National Lab., NM (United States)
Sponsoring Org:USDOE Assistant Secretary for Human Resources and Administration, Washington, DC (United States)
Country of Publication:United States
Language:English
Subject: 29 ENERGY PLANNING AND POLICY; 09 BIOMASS FUELS; 15 GEOTHERMAL ENERGY; LANL; RESEARCH PROGRAMS; HOT-DRY-ROCK SYSTEMS; RESOURCE POTENTIAL; ETHANOL; PRODUCTION; RENEWABLE ENERGY SOURCES; TECHNOLOGY ASSESSMENT; GEOTHERMAL RESOURCES; GEOTHERMAL ENERGY; BIOMASS Geothermal Legacy